To eliminate shadows under the chin, eyes, and cheeks, fixtures should be mounted on either side of the vanity mirror (or on the mirror's surface, if it's large), 36 to 40 inches apart. The center of each fixture should be roughly at eye level, or about 66 inches above the floor. This will guarantee even illumination across the face for grooming.

You also should avoid light pointing directly down on your head because it will be harsh and unflattering. Instead, position your ceiling light over the walkway area so you’re lit from behind rather than directly in front of the vanity.